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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670647a23a352d3ca09804572f43ac984401f3b880b3d9cab9ed73f06776bc93' 
  AND token = 'oOZG39mIMPJ6T5ryF7Pqu+bHMK3bF00cqYVUcvTolgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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