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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085b8a73f2c98635cd57625920a259e4d6e47c661dffb5e6fce04acf8b7cdd17' 
  AND token = '8fKP2JaoQnRwPT119c4+yBVfuPry2yQe7zc+XFGXTL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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