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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b3092a9a654894ce915300a321c07a878b094f316d8f56f949520b3967b2b5' 
  AND token = 'i4zdi/pO6jTaiEI1NrrzKDM0FChA+5OnpbfZzda3g4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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