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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ef2a427108ed57667e7beb8f3587dcc110bc38a5701489802351635b34ed83' 
  AND token = '5QiK7z7jrF4X6SfBAPf6HPJ566LA64WbigoNmpZew4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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