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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3c931e128efb063fff9b8d1ee17f295966411bfc0a9881740d7775d2e24ee4' 
  AND token = '98h8CWrwNzK5Usbo1yl4Yv/OcNMvyyrVEZxlzldjMiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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