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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb0c23b70dc154f1912ece94a3e1f657b81246447d45a630d95d3310b7a1498' 
  AND token = '7gGI577HORJ/wD/DFdia3Gd5EMZXJly82AJ2JRf3taU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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