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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e302e0476e2e476feabe37576bf75619acc43204f1d04ba82c45356eaac44e' 
  AND token = 'Hs/anh2iHD1qCYOI8/ATZ8hCaTZPcr1lwG3Kjxvm+TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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