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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f965e099fa4aac63255098892e6359f6389f1f1f8f1952a44d5a427fd418f3' 
  AND token = 'v0u31G/LD2BwQYnCVKKtoYZQHTM80U4m0LmuXxx/o6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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