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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97beacbea130a1887f7caf1fa8fbe990894b6770c7b535ea5e1dc3aca511c7c' 
  AND token = 'c4O1c2dGWBqqc5NsyKY/oinAEYlYmZe6YVQE169z5zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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