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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c82de3bc5f1897b47fe500349b99a293f5a0d984f981dab6aa648195b3e1cc9' 
  AND token = 'Zm6wFvFcYaq02RCqvhCch/b927jvE57WIXoqND5ECkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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