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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d0c5eecb1dfe927ccdbd6dcdc3fff896b43d5cd7b65f50f87d020c6f5be39c' 
  AND token = 'Caax1FadIyxNSTCvVBn5VTZ7Cnz0cVyClCQ0ERN67xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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