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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fdbb7db7b3fe8ff6b855ea19f50884062128b230cb019331137865e84ac20b' 
  AND token = 'fZ0eCjxQa9U75O6fK50rUntYB/NrwiRUeOFKY9LBrI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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