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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97416a8b1f59e8ce4c2eb1d2a5fb4f06087e787e7528f548e00c5b40df0b55a1' 
  AND token = '0GV3ZdGoUCbXaP+MA3nJrkV0E3Pfn4ne7hh5cKb8alk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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