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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb85800c85c9013cb260b59d5231d6454995b09482d22082679c662d475b750' 
  AND token = '5h7ayGpoghlXzvjClZ5Zj+b+VccMgFGeNMsOp/k5iEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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