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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd96550387978d4ef653f28d0bd55b0ffb5d851f4676efb2450d7c7a2165552' 
  AND token = 'c/JhKxumM3cVkJxoqRANM/kYtUgiZors7JMxodDMYBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}