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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea00aa1f15d46ade47b6f5faa3fd7bf0dad3c2e73445c074de513adc9cb3514b' 
  AND token = 'ySWfKJEyCkBjQY2MfnAs2A8CXMQeVfM8scNNF1y/sbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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