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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b01693dd5d0617567fdaefcd563da8d071c5d21856ddeacb4af325a0e8f8cbf' 
  AND token = '2Rhxpg/mvjU9HQRDZBduNu7o8ILIi9wtpgeqP7nef1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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