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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f6abd5ca64df633fc1fbad8c4142cc0f0487865bc9576cfcc403a6f37e24d8' 
  AND token = 'wdNmSmz0LtvXEvK4PvICC3zmXEw9NjpmpltAx3EMbf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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