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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549c67b4cb0d43f122d859e54c97b836b4d1d94b196ef53324043967ba3ee3b5' 
  AND token = 'vaUn+Z/IsgUbMkhJrdFYfT4pu2qVgF8Tb/8SQS3h0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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