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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330e3af2a4f6bbfd3ef856710f9e5914d8c2efd1d4b6718dfd10de1b9d04a67f' 
  AND token = 'gOdbahLQF7rLHlp3ciDmSN7NzzjXn+KtRDMa+D4SJKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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