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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116911e76e0643730fda8ce22ac2288684c4437b3ef2b7e5b90e31c691898027' 
  AND token = '+y5BeqfkNEcIA1HOcJZt090O84FQH55LTkNBfQ/8m6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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