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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62db67635d17e81e79dea0967ca833f27ae9818e3d45f778002d2ce492ef18b1' 
  AND token = 'DAQ1r0GM4WOoC0QrjeJxQQxbsStrCrNpwjxb03/8r8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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