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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1679c39b7c45eca1820d1e22ff42e7e49cc99faed77bc30c40296c8f717648' 
  AND token = '77qGlVOLGv29HClsGBG8TB1HNAziNOcc1LE1X/bFFCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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