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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffb4edf03720c3509d7281a8d3d6634fd0f0f81bb4d1353d2a57be9838568e4' 
  AND token = 'uUmkweJGEmX7Js2jie/de8Nv6OSdjN6Y9UeC7MjK2to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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