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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc83ce41e1241e9cf788c817e2871dd0cdee5c552c8df614311687bae2a4957e' 
  AND token = 'xi5+XLWJbQ2SPY5aIQv1nt0PdlKZt6G9KAkwjlK0p/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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