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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d4ceb259cdcd0bcbc4712b9ff8207646ef2abe2e6bb6a4da91e69225a98043' 
  AND token = 'G6BG6b1hQg9F5VxhpJBWcwSZ+Jvwzadm4LVfbBcb0ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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