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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5525e53a3a17be1534a65e6bb5c91077aeacb47743f5843cedd514a3a2f690' 
  AND token = '1TFUHsPUTOzA1dexKJaMPO30HrOiCFVkvzp1HjCa2kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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