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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2efaf76b423894a286afc85d30f49f80ac6a7b8e734244f9e990becb2cac5a' 
  AND token = 'ZxxDAtOKYb3U9yfrXkuaoozY+wwp3m7yybiPe/e6Eic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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