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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da45e3b3808bb8187b797ed324f056223ee7079157ba868a86e48cdfd9fabf7' 
  AND token = 'pj/u2ffCMS9jGvDavLe3wahP5iunEHB0Ye0QTa/C5MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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