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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a98065bd5bf90f4c00f5e0a1ebb52aeadc7d40dec40fcc918e6dee5184bab3' 
  AND token = 'Ijqh5rRRRUUui6vTfDUWvRGC8iYvATsqI9nPyxBfl50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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