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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40b4c340d7ac110e6b15cb6737dca4844c8cb40cd8d8fe5d3bc852d9b416a23' 
  AND token = 'DaRbpjgLoBHxAqNHZW9VkdxVvOU5t76bd6OtOslEgbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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