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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ae83fdc93fcaf10b0cbd4a835c55e533eca30e162349d02325f688494956ce7' 
  AND token = '87Zh86odg4PEoy2WtrK5peKY+Iuc5/2HXQRvVSkRtn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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