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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30acce148465d2361fc2437d835d48fa1c5edc05a4a659cc8afdb6e8597cd8d' 
  AND token = 'eDG4ri/tkYd9+3x8dQsoty+3LbbqKvkj3xClpCG81WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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