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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5547596caa605fb5092212c9a2e277a2fb71ef7b1e6ed76752161116ffe0aa78' 
  AND token = 'RN0r4AdvpokPr/0fB2FbHMwtgFeNh7aPC1aWOyiVS7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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