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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7cc308ef51e3a42c4dd20757828a95b63ceba081b87e9be480e00cf86c442e8' 
  AND token = 'RO18MXImfg2Q65BDY7ROB1FeYOLy+eJjxHtbJsvBo18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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