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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316bbf0e68fda221a9bf3c3d35e13b3abbf3caf20d8d6422bbb2b0dc7d0fa8ab' 
  AND token = 'JT1Arrcm7YGZTDvONO0nlmGKi2FHzeIlmswVx6+7veg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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