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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd55d47ee642a170f56aac445ce1470e6786bd6f778529a1244d37cb8b68fcbc' 
  AND token = 'VgUhIyeBibpG2JbIDnG/Fj0muWE3z7fcym6zJmVDJAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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