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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0dbd5029cd17c64287adde8f664f1e3d9253d44ada66a69515c43d89e56b70' 
  AND token = 'm2TxuQG2Z994Pja0WvJ/XiULH/Vw1l0+M3ONiXhs1Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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