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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5929e9f899368f4814bff9881a076cac1e9a02aceb3165ead385ebe90a1406' 
  AND token = 'kbCPdd0GGV+8+aagtXPRa8/u0m0A6msWWip3kIM9AvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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