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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b04a6e238cc3c5410d53dd3d1aebe8b980822218ec8d9f7137d0353d8d3cd55' 
  AND token = 'q6fToVYfsDgu1EslyCJ/3Ac1HOAa8FUfRQ8h4aHYIOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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