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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5cc75c982fa8b9d53055956e299e182769e9bf81d4bb4a59fde4765ed6526c' 
  AND token = 'QnUBlGBp7EaMZzRH8muZe8LBgKTM7nBlWlaujKi0j0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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