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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6435f3d5285e5eadc4bc42b2f84e681dadf524ebf93686990ca7771cc6a2c0ed' 
  AND token = 'S+fX4Hh34qdjuCcojNNMu+teJjfKt+NWaeo0ZZGfx+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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