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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b13e870c98ef18de8cee9db4afbffccdbd5494e6a8f68d22a4df1bfdae3ef59' 
  AND token = 'SkzvwBliGNgmd7kqHwqnCX55lxSRihCmQcPc4z50TwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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