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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9c476bd2b9730c39cc4ac3580baf4f4e3ade0a4cc110b49c77655100a906c9' 
  AND token = '7LfzCV/SnaoGNAULbaOVnj9+h/1hGY94VYxOYTPnEwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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