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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2382f3f67ca9ced1995f583116709fe6e56329948063f5a1e3ac44ebc08318a' 
  AND token = 'jhu138RMbx4velodPljPl2s7Uncd4ESJ2enksoj4uvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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