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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb694c18a8b9a4b0c263ca294ee26ed07a00505ebae2db2e87345979a13d6f83' 
  AND token = '6VOY6RaKl8iFBK4tMPom0CuOHTiAp7gTNKpSbLbkrjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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