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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26348a69d04c80e172d2fd1e617d8818295bebdfec54d570e92a35a54635bc9a' 
  AND token = 'IYPmjasGjTMsNQfM2RYdSGtC66VLJ4Vf4WNlHIskNnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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