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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb083891a1c8bfd4f479423bd1f73e8a5e42dc3bd555c40f3cde7be2f1bd3491' 
  AND token = '7glBbR6yE6JBqmQFOQJRvjm8mq2kUrlmUKS3W3WJ18c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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