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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0986b098b81390e5183f0ae24e433b22e9e6922fa9df8aa185f8795090edbe59' 
  AND token = 'n9NzWlrlOOXAmnEfSKeyggRVYD+xrmYnXaZtpf4r9EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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