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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e6562f7bd229cc6162c820b05699d98e4f9eae0ac5f7274b0e49a78609fb25' 
  AND token = 'TvUIRk9yD9H+GhIchCkGZraq+5c2NAUw9KMBe9OQ4fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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