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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584ba6de6643f9cdf40275a3b0835c63b11cf6c3771500a294c93156b4c35247' 
  AND token = 'DUoAOK2fH9hLxZlMIuKQJHeC9wO+1REbGRyRaTda0ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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