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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e1d93183057c728908597feca28d4e5ac9db87271b1d595258b957e3194281' 
  AND token = 'xJUfVNEENT7ZBxMiVCA+R12MIySOxZ2hRLhW8y9lpuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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