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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e046192ebe40ad4a5ebfef62d71197e12a72955a5b24695c753b77084dbeafa5' 
  AND token = 'KJaNPOyn/5UgGG2Q1NQ1Kup+G0G78K0VCd4IAR3XO5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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