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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c81b3cd7cf0de34e4d24cce99ede2b7a68f48597bc2fdb537974295be5fc29' 
  AND token = 'HLp+qYN5CfR+0cOPv/95H/CsqS33R6p5iQ0z6CaSssA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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