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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a515ab5219034f2ff724022e276f0e2ac136ace84638b8824eeb653f3bf2eab9' 
  AND token = 'I8hv7Zuwzr11hpQyj66NRN53PC5dpraxyF24KICN70g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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