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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3afd575dcc0021574613c3a9af29432fb5b45b734207eecc9d895d934cfc3d' 
  AND token = 'PAvExsiBDtHtN7ySoBR6sp3icQ7BAu5OEvB5BPPEhl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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