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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63174a36cfff890eba132762b38074bf3c855ed999f295217858d45e8ce21c8e' 
  AND token = 'ocFK+O5m4ARDIb2sXaRZxc/Zr53hi8YAxEW5im8aIkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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