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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ef205279b22aa82c0eedc2404663d1ccff2d2872824ea33663fba6db92b64c' 
  AND token = 'GLCvwC5o2Nvut/1bBYa1Z/P8YO8J/r8/a3Gn9c4zmgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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