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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d5a37d287bd7bece7ea0ffbf4f67f3eb1b9ba9b5069265b49f60281954ca49' 
  AND token = '5O1iKRtUw9xjRPLBRTEasp7vqHxeSrAz/i14da4wedc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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