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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9e59dbd54c78d9a4bc1115a69c6857d4e825aa1f7fde8866bae03df982a4b6' 
  AND token = '6mu0x68TE0XhC1evVEA+HnguojPpGNq7sI7LTlcBuvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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