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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a968893325140c90fa51334e6af0fbdf730764aaec95bf4c4656cf8918f0de8' 
  AND token = 'tCfVuc6rWEREAi0d1IRH1DsPHJwP9K+SYczjsGeQUXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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