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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970712a982fa2fb40b34c47ceed8a67b2d6cea2e8d5b02db886e41b329002736' 
  AND token = 'Aa8yxcfHW38+k9ClTke/mNeabmviRQRkihsdIh07ZJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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