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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d283439e27355eb6da508db4135dedba6853b69e7668ecf7f682caf4e3a470' 
  AND token = 'n2ChNwkRC/PXEy5wUrVIKNjefoODSY/nsZui2fQ6tAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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